Electrical condenser



-April 12, 1921, 4.334

P. E. GILLING ELECTRICAL CONDENSER Filed March 13. 1925 nwflvron PRESTONGILL/N6 Arron/m Patented Apr. 12 1927.

UNITED STATES I tartan TET FFICE.

ELECTRICAL oonnnnsnn.

Application filed Math 13, 1925. Serial No. 13,231.

This invention relates to an electrical condenser in which a stack ofalternate layers of mica and metal foil are built up in any satisfactorymanner such as described in Van Deventer Patent 1,181,623 issued May 2,1916, or'in the application of Harry A.

Hatch, SeriahN-o. 424,828 filed October 16 1920, now Patent 1,574,424,issued Feb. 23,

In the patent and application just referred to, special clamps are usedfor holding the stack together, said clamps also acting as terminals towhich electrical conductors may be connected.

My present invention is directed to an improved form of clamping meansfor the stack, which clalnpingmeans also utilizes one of the condenserelements of the stack.

A further object of my invention is to provide an improved-arrangementof binding the condenser elements into a complete unit so that thecondenser will hold its rated capacity over a long period of time.

Another object of my invention is to provide at least one pair ofcondenser element plates of such thickness that these plates may beutilized as the binding means, at the same time have formed thereonterminals to'which electrical conductors may be quickly attached.

Other objects will appear from a study of the followingspecificationtaken in connection with the annexed drawing wherein Figure1 isYaiplan'view of the condenser stack.

Figure 2 is an enlarged side view of the stack shown in'Fig. 1. v

Figure 3 is a top view of one of the outside condenser element plates.

Figure 4 is a bottom view of Fig. 3;

Figure 5 is a top view of the other outside element plate.

Figure 6 being a bottom view 61. Fig. 5.

Figure 7 is a plan view of one of the hind- -1I ing members.

Figure 8' is a side'e'zevation of the complete condenser showing a gridleak resistance unit mounted between the terminals of the condenser. I

Figure 9 is an end View of Fig. 8.

Figure 10 is a central longitudinal sectional. view through thecondenser without the grid leak.

I In the drawing wherein like numbers refer to corresponding parts inthevarious views, 1 is a stack made up of alternate layers of suitabledi-electric, such as mica and metal foilj Alternate metal foils havetheir ends brought out beyond the end of the stack and are bent downwardover the end and bottom of the stack as indicated at 2, while at theother end of the stack, the alternate metal foils are brought out andbent over the end of the stack as indicated at 3. Contacting with thebent over ends 2 and 3 is a pair of conducting plates 4 and 5. The plate4 is formed with a tongue 6 and a pair of fingers 7- and 8, the latterof which are bent so as to form eyelets 9 for the purpose of gripping aconductor or busbar which may he slid through said eyelets. The tongue6' of the plate 4, before it is formed to the position shown in Fig. 3.is first passed through a slot 10 in one of the binding members 11. Thebinding member is preferably made of strong insulating material. Abinding member 11 is on the bot tom'or on the outside of the plate 4 asindicated in Figs. 8 and'lO. The conducting plate 0 is similar to 4,except the tongue 6 is formed in reversed direction as will be seen inFigs. 5 and 6. A second binding member 11, exactly the same as the oneused in coi'inection-withplatej4,3is attached to the bottom of plate 5by passing the tongue 6 thereof through the slot 12. After the bindingmembers 11 have been assembled on the plates 4 and 5 through the mediumof the tongues 6, the plates are applied to opposite sides of the stack1 and the tongues 6 are bent downward into the slots 10 and 12 of thebinding member 11. Each of the plates 4 and 5 are preferably providedwith a clearance opening 13 larger than the openings 10 and 12 so thatthe tongues 6 will not short circuit the plates 4 and 5. The plates 4and 5 are made materially thicker than the foil plates comprising thestack 1 so as to have considerable stifiness themselves whereby theeyelets 9 may be formed directly from these plates and also the platesmay have extending terminals 14 and 15 respectively between which a gridleak or resistance element 16 may be mounted.

It is to be understood that the stack 1 may be of any desired thicknessdepending on the capacity required. For certain classes or work, forexample, in radio circuits, relatively low capacity condensers are usedand stack 1 for this purpose will then be very thin, in fact, thecondenser may be reduced in capacity in such a form as to consist ofonly the conducting plates 4 and 5 them selves without any intermediatestack or condenser elements.

My condenser may be mounted in any satisfactory manner as for example,the bus-bars may support the condenser entirely by being passed throughthe eyelets 9. In this case, the condenser can be slidably adjusted on abus-bar to balance up the radio set all as described in my applicationSerial No. 10,21elfiled February 19, 1925.

iVhile I have described one form of my invention it is apparent that thedetails may be varied without departing from the spirit of the inventionor the scope of the appended claims.

Having thus described my invention what I claim is:

1. An electrical condenser comprising a stack of the characterdescribed, having the protruding ends of one group of foils bent overthe end of the stack in one direction and the ends of the other groupbent over the other end of the stack in an opposite direction, acondenser element plate on each side of the stack engaging respectivelysaid bent over foil ends, a pair of binding members over said plates,portions of said plates acting as fastening means to draw and clamp thebinding members against the stack and terminal connecting means on saidplates.

2. An electrical condenser comprising a stack of the characterdescribed, having the protruding ends of one group of foils bent overthe end of the stack in one direction and the ends of the other groupbent over the other end of the stack in an opposite direction, acondenser element plate on each side 01. the stack engaging respectivelysaid bent over loil ends, a pair of insulating binding members over saidplates, a portion of one plate engaging the same ends of both bindingmembers while a portion oi. the other plate engages the other ends ofboth binding members, to clamp said members onto the stack and terminalconnecting means on said plates.

3. An electrical condenser comprising a stack of the characterdescribed, havingl'he protruding ends of one group of toils bent overthe end of the stack in one direction and the ends of the other groupbent over the other end of the stack in an opposite direction, acondenser element plate on each side of the stack engaging respectivelysaid bent over ioil ends, a pair of insulating binding n'ieini'iers oversaid plates, a portion of one plate passing through an opening in theend of one binding member and over the end of the other bindingmemberwhile a portion of the other plate is similarly disposed with respect tothe other ends of said binding members and terminal connecting means onsaid plates.

4. An electrical condenser comprising a stack of the characterdescribed, having the protruding ends of one group of foils bent overthe end of the stack in one direction and the ends of the other groupbent over the other end of the stack in an opposite direction, a pair ofcondenser element plates, lying over said stack and having grippingtongues formed thereon but in opposite directions, a pair of bindingmembers of insulating material each having slots therein at oppositeends to receive said tongues as described so as to bind said memberssecurely to the stack, said plates each being provided with at least onecircuit connecting means.

5. An electrical condenser comprising a stack of the characterdescribed, having the protruding ends of one group of foils bent overthe end of the stack in one direction and the ends of the other groupbent over the other end of the stack in an opposite direction, a pair ofcondenser element plates lying over said stack and having grippingtongues formed thereon but in opposite directions, a pair of bindingmembers of insulating material each having slots therein at oppositeends to receive said tongues as described, one tongue passing all theway through one of the slots in one of said members and then being bentover the end of the stack and the end of said second member into theslot in that end while the tongue on the other plate passes all the waythrough the remaining slot in the said second member and being bent overthe opposite end of the stack into the remaining slot in the firstmentioned member thereby clamping the member securely to the stack, saidplates each having at least one circuit connecting means providedthereon.

6. An electrical condenser comprising a stack having a plurality ofthinconducting plates separated by thin di-electric plates, a pair ofconducting plates much thicker than said" thin plates, on the outersides of the stack, said conducting plates acting as condenser elementsand joined with said thin conducting plates, ii' any, to make up thestack, an insulating binding member outside each of said thickerconducting plates, means on said thicker plates for clamping saidbinding members against themselves and the stack and at least onecircuit connecting means provided on each of said thicker plates.

7. An electrical condenser having at least a pair of conducting platesof relatively good stiffness, said conducting plates acting as condenserelements and joined With said thin conducting plates, if any, to make upthe stack, an insulating binding member outside each of said plates,means preferably integral With each of said plates for clamping saidbinding members against themselves and at least one circuit connectingmeans provided on each of said plates.

In testimony whereof, I aflix my signatnre.

PRESTON E. GILLING.

